Abbreviations: AIDS=acquired immunodeficiency syndrome; AF=atrial fibrillation; BMI=body mass index; CKD=chronic kidney disease; HF=heart failure; ICD=implantable cardioverter defibrillator; LVEF=left ventricular ejection fraction; OAC=oral anticoagulant; s.d.= standard deviation; TV=transvenous device; TWO=two wave oversensing; VF=ventricular fibrillation; VT=ventricular tachycardia.